38 results about "Gaseous Mediators" patented technology

The pressurization system comprises a liquid outlet pipeline, a vaporizer, a buffer tank and a heat exchange loop, the liquid outlet pipeline is communicated to a low-temperature container, the vaporizer and the buffer tank are both communicated to the liquid outlet pipeline, and the buffer tank is located on the downstream of the vaporizer, so that the buffer tank can store gaseous media heated and vaporized by the vaporizer. The heat exchange loop is communicated to the buffer tank and is communicated with a circulating pump and a heat exchange device, the circulating pump can drive a gaseous medium in the buffer tank to flow along the heat exchange loop, the heat exchange device is connected to the low-temperature container, and the gaseous medium can conduct heat exchange on the low-temperature container through the heat exchange device; the heat carried by the gaseous medium is transferred into the low-temperature container, and the liquid medium in the low-temperature container absorbs heat and is vaporized, so that the volume of the medium in the low-temperature container is increased, the pressure in the low-temperature container is improved, the low-temperature container can be quickly pressurized when being at a low liquid level, and liquid supply or gas supply of the low-temperature container is facilitated.

The invention relates to the technical field of nuclear power, in particular to a testing device and a testing method for nuclear fuel cladding blasting. The testing device comprises a reaction container, a heating mechanism, a vacuum mechanism, a pressure detection mechanism and a to-be-tested workpiece, wherein the reaction container is provided with a reaction cavity; the heating mechanism is used for heating the reaction cavity; the vacuum mechanism is used for vacuumizing the reaction cavity; the pressure detection mechanism is used for detecting air pressure change in the reaction cavity; a to-be-detected workpiece is arranged in the reaction cavity, the to-be-detected workpiece is provided with an accommodating cavity, and a detection medium is pre-sealed in the accommodating cavity; wherein if the heating temperature of the heating mechanism to the reaction cavity reaches the blasting critical value of the to-be-detected workpiece, the to-be-detected workpiece is blasted, the detection medium is in the form of a gaseous medium, the gaseous medium flows from the interior of the accommodating cavity to the reaction cavity, and the pressure detection mechanism can detect the air pressure change in the reaction cavity after the to-be-detected workpiece is blasted. According to the test method, the test device is applied to test experiments. The testing device and the testing method are wide in applicability.

The present invention relates to an injector (1) for injecting a gaseous medium, in particular a gaseous fuel, preferably hydrogen, into a combustion chamber (20) of an internal combustion engine. The injector (1) comprises, inter alia, an axially movable valve-closing element (5) for opening and closing at least one opening at a sealing seat (7), an actuator (21) for actuating the valve-closing element (5), and a flow-influencing geometry (10) arranged downstream of the sealing seat (7) in terms of flow. According to the invention, the flow-influencing geometry (10) is designed such that it is formed downstream of the sealing seat (7) in an attachment body (8), the attachment body (8) having a hollow-cylinder-shaped portion in the region of the sealing seat (7), the hollow-cylinder-shaped portion being adjoined by an outflow region (16) having at least one outflow opening (17) which has an inner contour (9) and opens out at an end side (25) facing the combustion chamber (20), the end side (25) being beveled toward the outflow opening (17) with an at least partially circumferential beveled region (26) which improves flushing behavior from the outflow opening (17).

The present invention relates to an injector (1) for injecting a gaseous medium, in particular a gaseous fuel, preferably hydrogen, into a combustion chamber (20) of an internal combustion engine. The injector (1) comprises, inter alia, an axially movable valve closing element (5) for opening and closing at least one opening on a sealing seat (7), an actuator (21) for actuating the valve closing element (5), and a flow-control geometry (10) located downstream of the sealing seat (7).According to the invention, the flow control geometry (10) is designed such that it is formed downstream of the sealing seat (7) in an attachment body (8), wherein the attachment body (8) has a hollow cylindrical section in the area of ​​the sealing seat (7), to which an outflow area (16) with at least one outflow opening (17) having an inner contour (9) is connected, which opens into an end side (25) facing the combustion chamber (20), wherein in the transition from the hollow cylindrical section to the at least one outflow opening (17) the inner contour (9) has a trough-like section (22), from which at least one additional opening (24) is connected with the outer contour of the attachment body (8) in order to improve a scavenging behavior from the outflow opening (17).

The present invention relates to an injector (1) for injecting a gaseous medium, in particular a gaseous fuel, preferably hydrogen, into a combustion chamber (20) of an internal combustion engine. The injector (1) comprises, among other things, an axially movable valve closing element (5) for opening and closing at least one opening on a sealing seat (7), an actuator (21) for actuating the valve closing element (5), and a flow control geometry (10) downstream of the sealing seat (7), wherein the flow control geometry (10) is designed such that it is formed downstream of the sealing seat (7) in an attachment body (8), wherein the attachment body (8) has a hollow cylindrical section in the area of ​​the sealing seat (7), to which an outflow area (16) with at least one outflow opening (17) having an inner contour (9) is connected, which opens into an end side (25) facing the combustion chamber (20).According to the invention, the outflow region (16) downstream of the sealing seat (7) has a trough-like section (22) to which at least one outflow opening (17) is connected downstream, wherein the trough-like section (22) has a volume V1 and the outflow opening (17) has a volume V2, or, in the case of several successive opening sections in the flow direction with different orientations, the outflow opening (17) has several volumes V2, V3, and for the volumes V1 > V2 and V1 > V3, wherein the axial extent of the at least one outflow opening (17) is at least one third of the total axial extent of the outflow region (16) between the sealing seat (7) and the end face (25).

The utility model discloses a gas medium circulating cooling system, relates to the technical field of cooling systems, and is mainly used for solving the problem that a pipeline interface of an existing liquid cooling system is easy to leak due to high-frequency pressure fluctuation caused by a circulating pump. The lower surface of the liquid medium cavity is tightly attached to a heating piece, a gaseous medium cavity communicated with the liquid medium cavity is formed above the liquid medium cavity, and the upper portion of the gaseous medium cavity is communicated with the input end of gradual change type gas cooling equipment through a gaseous medium output pipe; the output end of the gradual change type gas cooling equipment is in direct connection with the gaseous medium cavity through a gaseous medium input pipe, and the output end of the gaseous medium input pipe is located below the input end of the gaseous medium output pipe. The gas medium circulating cooling system has the advantages of being simple in structure, convenient to maintain, good in cooling effect and low in liquid cooling medium leakage risk.

The present invention relates to an injector (1) for injecting a gaseous medium, in particular a gaseous fuel, preferably hydrogen, into a combustion chamber (20) of an internal combustion engine. The injector (1) comprises, inter alia, an axially movable valve closing element (5) for releasing and closing at least one opening on a sealing seat (7), an actuator (21) for actuating the valve closing element (5), and a flow-influencing geometry (10) which is arranged downstream of the sealing seat (7) in terms of flow, wherein the flow-influencing geometry (10) is designed in such a way that it is formed in an attachment body (8) downstream of the sealing seat (7), wherein the attachment body (8) has a hollow cylindrical section in the region of the sealing seat (7), which is adjoined by an outflow region (16) having at least one outflow opening (17) having an inner contour (9), which outflow opening opens into an end side (25) facing the combustion chamber (20). According to the invention, the outflow region (16) has, downstream of the sealing seat (7), a trough-like section (22) which is adjoined, downstream, by at least one outflow opening (17), wherein the trough-like section (22) has a volume V1 and the outflow opening (17) has a volume V2 or, in the case of a plurality of opening sections which follow one another in the flow direction and have different orientations, the outflow opening (17) has a plurality of volumes V2, V3, and the following applies for the volumes: V1 > V2 and V1 > V3, wherein the axial extension region of the at least one outflow opening (17) is at least one third of the entire axial extension of the outflow region (16) between the sealing seat (7) and the end side (25).

Method for actuating a tank device (1) for storing a gaseous medium, comprising at least two tank containers (2) and a feed line (3) which can be connected to the tank containers (2). Each tank container (2) has at least one pressure-controlled control valve (5), via which gaseous medium flows from the tank device (1) into the feed line (3) in the direction of a load system (40). The invention is characterized by the following step:a. simultaneously opening the control valves (5) of the tank container (2) in a span of milliseconds while supplying the load system (40) such that a gaseous medium is conducted from the tank device (1) in the direction of the load system (40) via the feed line (3).

The invention relates to an injector for blowing gaseous media, in particular gaseous fuel, preferably hydrogen, into a combustion chamber of an internal combustion engine, comprising an axially movable valve closure element for opening and closing at least one opening on a sealing seat, an actuator for actuating the valve closure element, and a flow-influencing geometry arranged fluid-technically downstream of the sealing seat, which is formed in a sleeve downstream of the sealing seat, the sleeve having a hollow-cylindrical section in the region of the sealing seat, a flow-out region with at least one flow-out opening being adjoined to the hollow-cylindrical section, the flow-out opening having an inner contour, the flow-out opening merging into an outer contour of the sleeve, in particular on the end facing the combustion chamber. Here, the flow-out region has a recessed section downstream of the sealing seat, at least two flow-out openings being adjoined downstream of this section, the material region between the at least two flow-out openings serving as a beam splitter and assuming the beam shaping of the gas flow path in the flow-out openings.

The present invention relates to an injector (1) for injecting a gaseous medium, in particular a gaseous fuel, preferably hydrogen, into a combustion chamber (20) of an internal combustion engine. The injector (1) comprises, inter alia, an axially movable valve closing element (5) for opening and closing at least one opening on a sealing seat (7), an actuator (21) for actuating the valve closing element (5), and a flow-control geometry (10) located downstream of the sealing seat (7).According to the invention, the flow control geometry (10) is integrated in a multi-part attachment body (8), wherein the attachment body (8) comprises a cap-like base body (23) which can be attached to a nozzle body (2) of the injector (1), and the base body (23) has a receiving opening (25) into which an insert part (24) can be inserted and attached, wherein the insert part (24) is pressed into and / or welded firmly into the base body (23) and has at least one outlet bore (31).

The invention relates to an injector (1) for blowing a gaseous medium, in particular a gaseous fuel, preferably hydrogen, into a combustion chamber (20) of an internal combustion engine. Here, the injector (1) comprises in particular: an axially movable valve closing element (5) for releasing and closing at least one opening on a sealing seat (7); an actuator (21) for actuating the valve closing element (5); and a flow-influencing geometry (10) arranged hydrodynamically downstream of the sealing seat (7). According to the invention, the flow-influencing geometry (10) is embodied in such a way that the following relationship is satisfied when the needle stroke (lh) of the valve closing element (5) is maximum: 5 * lhs 1.5 * lh, (s) is the distance between the radial outer contour of the valve closing element (5) at the downstream edge region thereof and an annular line on a section (12) of the flow-influencing geometry (10) which is located below in the axial projection and which contracts in the flow direction, in order to produce a substantially lossless flow downstream of the valve closing element (5).

The invention relates to an injector for blowing gaseous media, in particular gaseous fuel, preferably hydrogen, into a combustion chamber of an internal combustion engine, comprising an axially movable valve closure element for opening and closing at least one opening on a sealing seat, an actuator for actuating the valve closure element, and a flow-influencing geometry arranged fluid-technically downstream of the sealing seat, which is formed in a sleeve downstream of the sealing seat, the sleeve having a hollow-cylindrical section in the region of the sealing seat, a flow-out region with at least one flow-out opening being adjoined to the hollow-cylindrical section, the flow-out opening having an inner contour, the flow-out opening merging into an outer contour of the sleeve, in particular on the end facing the combustion chamber. Here, the flow-out region has a recessed section downstream of the sealing seat, at least two flow-out openings being adjoined downstream of this section, an insert between the at least two flow-out openings serving as a beam splitter and assuming the beam shaping of the gas flow path in the flow-out openings.

The present invention relates to an apparatus (1) for storing a gaseous medium, such as hydrogen or natural gas, the apparatus comprising a storage line (20) to which at least one tank container (6) is connected. Furthermore, the at least one tank container (6) forms a fluid-sealed connection (90) with the storage line (20) by means of a double-nut threaded connection element (5), wherein the double-nut threaded connection element (5) has a right-hand thread and a left-hand thread.

The invention relates to a delivery device (1) for a fuel cell system (31) for delivering and / or controlling a gaseous medium, in particular hydrogen, having a jet pump (4) which is driven by a pressurized propulsion jet (20) of the gaseous medium, and having a metering valve (6), the outlet (16) of the delivery device (1) being fluidically connected to the anode inlet (15) of a fuel cell (29), and the outlet (16) of the delivery device (1) being fluidically connected to the anode inlet (15) of the fuel cell (29). The injection pump (4) has a base body (13) and a nozzle (12) is arranged in the base body (13) between the metering valve (6) and the injection pump (4), the nozzle (12) having an inner channel (14) extending along an axis of symmetry (32), the injection pump (4) having a suction region (7), a mixing tube (9) and a diffuser region (20), the mixing tube (9) being arranged in the inner channel (14), and the diffuser region (20) being arranged in the mixing tube (9). The diffuser region (20) is at least directly fluidically connected to the anode inlet (15) of the fuel cell (29), and wherein the jet pump (4) extends at least partially in a direction parallel to a first flow direction (V) of an axis of symmetry (32) and through which a gaseous medium flows. The nozzle (12) has an asymmetric outlet diffuser (33) in the opening of the channel (14) thereof facing the suction region (7) and / or the mixing tube (9). The invention also relates to a method for producing the nozzle (12) for the conveying device (1) and / or the fuel cell system (31).

The present invention relates to an injector (1) for injecting a gaseous medium, in particular a gaseous fuel, preferably hydrogen, into a combustion chamber (20) of an internal combustion engine. The injector (1) comprises, inter alia, an axially movable valve-closing element (5) for opening and closing at least one opening at a sealing seat (7), an actuator (21) for actuating the valve-closing element (5), and a flow-influencing geometry (10) arranged downstream of the sealing seat (7) in terms of flow. According to the invention, the flow-influencing geometry (10) is designed in such a way that it is formed in an attachment body (8) downstream of the sealing seat (7), wherein the attachment body (8) has a hollow-cylindrical portion in the region of the sealing seat (7), which hollow-cylindrical portion is adjoined by an outflow region (16) with at least one outflow opening (17) which has an inner contour (9) and opens out in an end side (25) which faces the combustion chamber (20), wherein the end side (25) is equipped, in an inclined manner facing the outflow opening (17), with an at least partially encircling beveled region (26) which improves the flushing behaviour from the outflow opening (17).

Method for producing a CoFe alloy, comprising: Providing a melt consisting of 35 wt% ≤ Co ≤ 55 wt%, 0 wt% ≤ V ≤ 3 wt%, 0 wt% ≤ Ni ≤ 2 wt%, 0 wt% ≤ Nb ≤ 0.50 wt%, 0 wt% ≤ Zr + Ta ≤ 1.5 wt%, 0 wt% ≤ Cr ≤ 3 wt%, 0 wt% ≤ Si ≤ 3 wt%, 0 wt% ≤ Al ≤ 1 wt%, 0 wt% ≤ Mn ≤ 1 wt%, 0 wt% ≤ B ≤ 0.25 wt%, 0 wt% ≤ C ≤ 0.1 wt%, balance Fe, and up to 1 wt% impurities, wherein the impurities are one or more of the may contain group O, N, S, P, Ce, Ti, Mg, Be, Cu, Mo and W Pouring the molten metal under vacuum and subsequent solidification into a cast block, Hot rolling of the cast ingot into a slab and then into a hot-rolled strip with a thickness D1, followed by quenching of the strip from a temperature above 700°C to a temperature below 200°C, Cold rolling of the hot-rolled strip to an intermediate strip with a thickness D2, Intermediate annealing of the intermediate strip in a continuous process at a temperature above 700°C, wherein the intermediate strip is cooled at a temperature above 700°C to a temperature below 200°C in a gaseous medium, Cold rolling of the heat-treated intermediate strip with a metallically bright surface to a strip with a thickness D3, wherein the degree of cold forming is (D2-D3) / D2 ≤ 80%.

The present invention relates to an injector arrangement comprising an injector (1) for injecting a gaseous medium, in particular a gaseous fuel, preferably hydrogen, into a combustion chamber (20) of an internal combustion engine. The injector (1) comprises, inter alia, an axially movable valve-closing element (5) for opening and closing at least one opening at a sealing seat (7), an actuator (21) for actuating the valve-closing element (5), and a flow-influencing geometry (10) which is downstream of the sealing seat (7) in terms of flow. The injector (1) is held in an opening (25) in a cylinder head (23) which, together with a combustion chamber roof, closes off the combustion chamber (20). According to the invention, the flow-influencing geometry (10) is made in such a way that it is formed downstream of the sealing seat (7) in an attachment body (8) and a contouring at the downstream end of the opening (25) in the cylinder head (23) at the transition to the combustion chamber roof assists the guidance of the flow by means of a geometric flow-influencing element (26).

The present invention relates to an injector (1) for injecting a gaseous medium, in particular a gaseous fuel, preferably hydrogen, into a combustion chamber (20) of an internal combustion engine. The injector (1) comprises, inter alia, an axially movable valve-closing element (5) for opening and closing at least one opening at a sealing seat (7), an actuator (21) for actuating the valve-closing element (5), and a flow-influencing geometry (10) arranged downstream of the sealing seat (7) in terms of flow. According to the invention, the flow-influencing geometry (10) is designed in such a way that it is formed in an attachment body (8) downstream of the sealing seat (7), wherein the attachment body (8) has a hollow cylindrical section in the region of the sealing seat (7), which hollow cylindrical section is adjoined by at least one sleeve section (22) which extends over a circumferential region of the attachment body (8), has an axial length (L, L1, L2) and has an inner contour (9), said sleeve section enabling the gas flow to be directed or guided.

The present invention relates to an injector (1) for injecting a gaseous medium, in particular a gaseous fuel, preferably hydrogen, into a combustion chamber (20) of an internal combustion engine. The injector (1) comprises, among other things, an axially movable valve closing element (5) for opening and closing at least one opening on a sealing seat (7), an actuator (21) for actuating the valve closing element (5), and a flow control geometry (10) downstream of the sealing seat (7), wherein the flow control geometry (10) is designed such that it is formed downstream of the sealing seat (7) in an attachment body (8), wherein the attachment body (8) has a hollow cylindrical section in the area of ​​the sealing seat (7), to which an outflow area (16) with at least two outflow openings (17) having an inner contour (9) is connected, which open into an end side (25) facing the combustion chamber (20).According to the invention, the outflow area (16) downstream of the sealing seat (7) has a trough-like section (22) to which the at least two outflow openings (17) are connected downstream, wherein an insert part (30) between the at least two outflow openings (17) acts as a jet splitter and performs jet shaping of the individual gas flow paths (4) in the outflow openings (17).

A temperature control device for a gaseous media. The temperature control device includes a first heat exchanger layer in which a medium channel for a gas to be temperature-controlled is formed, a second heat exchanger layer which extracts heat from and / or supplies heat to the first heat exchanger layer, and a diffusion layer which is arranged between the first heat exchanger layer and the second heat exchanger layer. The diffusion layer is open to the gas to be temperature-controlled.

The invention provides a low-temperature storage tank evaporation rate testing system and a testing method thereof. The low-temperature storage tank evaporation rate testing system comprises a liquid outlet pipeline, a temperature returning device, an exhaust pipeline, a testing pipeline, a first valve, an emptying pipeline and a testing assembly. One end of the liquid outlet pipeline is communicated with the low-temperature storage tank; the temperature returner is communicated with the other end of the liquid outlet pipeline; one end of the exhaust pipeline is communicated with the temperature returning device; one end of the test pipeline is communicated with the temperature return device, and the test pipeline and the exhaust pipeline are arranged in parallel; the first valve is communicated with the test pipeline; one end of the emptying pipeline is communicated with one end of the test pipeline and the exhaust pipeline far away from the temperature recuperator, and the other end is provided with an emptying port; the test assembly is used for detecting the state information of the gaseous medium in the test pipeline. According to the low-temperature storage tank evaporation rate testing system, the exhaust pipeline connected with the testing pipeline in parallel is arranged, so that air flow sequentially passes through the testing pipeline and the emptying pipeline instead of the testing pipeline when the low-temperature storage tank is emptied, and the phenomenon that the precision is reduced and even the low-temperature storage tank is damaged due to over-travel operation of a measuring instrument communicated with the testing pipeline is avoided.

The present invention relates to an injector arrangement comprising an injector (1) for injecting a gaseous medium, in particular a gaseous fuel, preferably hydrogen, into a combustion chamber (20) of an internal combustion engine. The injector (1) includes, among other things, an axially movable valve closing element (5) for opening and closing at least one opening on a sealing seat (7), an actuator (21) for actuating the valve closing element (5), and a flow-control geometry (10) located downstream of the sealing seat (7). The injector (1) is received in an opening (25) of a cylinder head (23) which closes off the combustion chamber (20) with a combustion chamber roof.According to the invention, the flow control geometry (10) is designed such that it is formed downstream of the sealing seat (7) in an attachment body (8) and a contour at the downstream end of the opening (25) of the cylinder head (23) in the transition to the combustion chamber roof supports the flow guidance by means of a geometric flow control means (26).

The invention relates to a reservoir system (1) for storing a cryogenic medium for a fuel cell system, comprising: a pressure vessel (3) for receiving the medium; a gas delivery line (4) for filling / extracting a gaseous medium from the pressure vessel; the invention relates to a pressure vessel (1) comprising a gas supply line (5) for supplying / extracting a liquid medium from the pressure vessel, and a liquid supply line (5) for supplying / extracting a liquid medium from the pressure vessel, the gas supply line and the liquid supply line being coupled to a controllable shut-off device (6), the gas supply line and / or the liquid supply line having a heating element (7) for heating the medium in the pressure vessel. The invention further relates to a fuel cell system.

A sampling apparatus for sampling from a product flow, wherein the sampling apparatus includes at least one sampling cup having a filling opening, wherein the sampling cup is movably arranged between extracted position and retracted position by an actuator system, wherein the extracted position includes a position for allowing the sampling cup to intersect the product flow. The sampling apparatus further includes a blow system including one or more nozzles arranged to direct a pressurized gaseous medium across the filling opening so as to remove excess sample material extending above the filling opening, while the sampling cup is located in one or more extracted position.

The application discloses a heat exchange system applied to molten salt energy storage heating and an operation method thereof, and particularly relates to the field of molten salt energy storage heating, and comprises the following steps: S1, fault diagnosis is conducted on each device of the system; S2, high-temperature loop starting is completed through heat medium loop starting, circulating pump starting, flow regulation and buffer tank pressure correction; S3, the molten salt loop is started and temperature control is conducted, the valve opening degree is adjusted based on a formula to stabilize the flow of the high-temperature loop, the total flow of the circulating pump is controlled synchronously, and the stable conditions of flow, molten salt outlet temperature and pump pressure are met, so that it is determined that the loop starting is completed; the intermediate medium in the heat exchange system is liquid, and the heat exchange system is driven by a circulating pump, so that the operation reliability and economy are higher than those of gaseous medium; the heat exchange system can be applied to heat exchange with a temperature difference greater than 500 DEG C, and can guarantee the thermal stress safety of the heat exchanger and the medium safety; and the application reduces the investment cost of the pump by reducing the design temperature of the circulating pump.

A substrate is provided for the capture, desorption, and collection of carbon dioxide from gaseous media with improved yield and overall efficiency. The substrate includes sorbents composed of alkali-containing compounds such as K2O and Na2O, nano-dispersed on metal oxide carriers such as porous A12O3, in the presence of catalysts such as nickel or ruthenium. CO2 is adsorbed from gases, including ambient air, contacted with the substrate. The CO2 is then desorbed via contact with a moist inert gas desorption medium. Exemplary embodiments using nitrogen gas (N2) having between 1 mol% and 2 mol% moisture content desorbed significantly more CO2 between 150°C and 200°C, and at a higher rate, compared to dry desorption conditions and elevated temperatures. Realizing these benefits at lower temperatures and at the vapor pressure of water at 25 °C for CO2 desorption decreases the energy costs associated with direct air capture of carbon dioxide.

A claw pump (10) for generating a vacuum, the claw pump comprising: a housing having an inlet and an outlet; at least one pump stage (12) constructed as a claw pump stage in the housing, driven by the electric motor to convey the gaseous medium from the inlet to the outlet; a temperature sensor (18) connected to the outlet to detect the temperature of the claw pump (10); and a controller (20) connected to the temperature sensor (18), where the controller (20) is configured to generate a first control signal if the temperature of the claw pump (10) exceeds a first temperature threshold.

A system (1) for metering a liquid or gaseous medium comprises a pressure control valve (4) and a flow sensor, the pressure control valve (4) and the flow sensor forming a closed control loop (6). The required metering quantity can be adjusted by controlling the metering pressure (p2) by means of the pressure control valve (4).

The present invention relates to an injector (1) for injecting a gaseous medium, in particular a gaseous fuel, preferably hydrogen, into a combustion chamber (20) of an internal combustion engine. The injector (1) in this case, in particular, has an axially movable valve closing member (5) for opening and closing at least one opening in a seal seat (7), an actuator (21) for operating the valve closing member (5), and a flow-influencing geometry (10) located downstream of the seal seat (7) in a flow-technically manner. According to the present invention, the flow-influencing geometry (10) is the needle stroke (I h When ) is at its maximum, the following relationship holds: 5 × I h ≥s ≥ 1.5 × I h The following holds true, in which case (s) is the distance between the radially outer contour of the valve closing member (5) in the downstream edge region of the valve closing member and the annular line at the tapered portion (12) in the flow direction of the flow-influencing geometry (10) located below it in the projection view in the axial direction, thereby generating a flow with virtually no loss downstream of the valve closing member (5).

The present invention relates to an injector (1) for injecting a gaseous medium, in particular a gaseous fuel, preferably hydrogen, into a combustion chamber (20) of an internal combustion engine. The injector (1) comprises, inter alia, an axially movable valve closing element (5) for opening and closing at least one opening on a sealing seat (7), an actuator (21) for actuating the valve closing element (5), and a flow-control geometry (10) located downstream of the sealing seat (7).According to the invention, the flow control geometry (10) is designed such that it is formed downstream of the sealing seat (7) in an attachment body (8), wherein the attachment body (8) has a hollow cylindrical section in the region of the sealing seat (7), to which at least one sleeve section (22) extending over a circumferential region of the attachment body (8) and having an axial length (L, L1, L2) with an inner contour (9) is connected, which enables gas flow control or guidance.